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<b>let </b><font color="Maroon">o</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">m</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<a NAME="E1:77"/>
 <a href="cat_1.html#K8">1Cat</a> <font color="Maroon">o</font>,<font color="Maroon">m</font> is <a href="nattra_1.html#V2" target="_self">discrete</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:77"/>
 <a href="nattra_1.html#K13" target="_self">IdCat</a> <span class="p1">(<span class="default"><a href="cat_1.html#K8">1Cat</a> <font color="Maroon">o</font>,<font color="Maroon">m</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K8">1Cat</a> <font color="Maroon">o</font>,<font color="Maroon">m</font>
 <b>by </b><i/>;<br/>


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